Istanbul -LRB- CNN -RRB- A woman carried out a suicide bombing at a police station in Istanbul 's historic Sultanahmet district Tuesday evening , killing one police officer and injuring another , officials said .

The attack happened in the section of Turkey 's largest city that is home to landmarks such as the Hagia Sophia and the Blue Mosque , and is heavily trafficked by tourists .

The bomber , speaking English , entered the police station saying she lost her wallet , and the explosion happened at about 5:20 p.m. , Istanbul Gov. Vasip Sahin told reporters . Sahin did not mention a motive for the attack .

Sahin initially said that the blast , besides killing the bomber , critically injured one police officer and slightly wounded another . Later Tuesday , Turkey 's semi-official Anadolu news agency reported that one of the officers died of his wounds at a hospital .

Police cordoned off the area . The attacker 's identity is unknown and the incident is being investigated , the governor told reporters .

CNN 's Gul Tuysuz reported and wrote from Istanbul , and CNN 's Jason Hanna wrote in Atlanta . CNN 's Hande Atay contributed to this report .

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Woman detonates bomb after saying she 'd lost her wallet , Istanbul governor says

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Attacker 's identity , motive not immediately known , governor says

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Attack happened at police station in popular tourism district